MOSSES AND FERNS 



CHAP. 



B. 



T. 



Sp. 



FIG. 242. Azolla filiculoides. A, Mature sporophyte, X2; B, lower surface of a branch 

 with two microsporangial sori (sp), X6; C, macrosporangial (ma) and niicrospo- 

 rangial (mi) sori, XIQ, 



